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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc61b8a6c049d3019cbccbab8cebc0bcba0cc4cb996da69a96ca9cde0b32fbbf' 
  AND token = 'rxZA20N9d6tME6I1Spz0wQCTHFShRiNXgWr9a+afJAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}